Thread-laying mechanism for sewing-machines.



s. c. TATE. THREAD LAYING MECHANISM FOR SEWING MACHINES.

APPucATIbN man MAY :8. 1916.

Patented J 11116 11, 1918 4 SHEETSSHEET I.

1,268,89&-

JUC

Ill-II l I I III p s. G. TATE. THREAD LAYING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAY 18. i916.

Patented June 11, 1918.

4 SHEETSSHEET 2- HINES.

APPLICATION FILED MAY 18, 1916- Patented J 11116 11,1918.

4 SHEETS-SHEET 3.

S. G. TATE. THREAD LAYING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAY 18. 19I6- Patented June 11, 1918. v 4 SHEETS-SHEET 4- SUJEL GEORGE TATE, OF CHICAGO,

rumors, assronoa T0 t a o UNION SPECIAL MAC 1: ill) 51 COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

THREAD-LAYING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented June ii, tare.-

Application filed May 18, 1916. Serial No. 98,390.

' v To all whoin it may concern:

Be it known that I, SAMUEL GEORGE TATE, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Thread-Laying Mechanism for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in thread laying mechanisms for sewing machines, and more articularly to a thread laying mechanism or laying a thread on the upper face of a fabric being stitched, said thread being concatenated with the needle threads of a two-needle stitching mechanism.

An object of the invention isto provide a threadlaying mechanism wherein the thread is formed into loops by a reciprocating hook cooperating with a fixed thread guide, which hook, together with the fixed thread guide and the feed of the material, properly positions the loop for the entrance only of the needle farthest removed from the thread guide.-

A furthiei' object of the invention is to provide a thread laying hook which cooperates with the fixed thread guide, which thread hook passes between a loop of thread for the entrance of the .needle farthest removed from the thread guide.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings, illustration one e tiOn I'.

Figure l is a view showing more or less diagrammatically a portion of a sewing machine above the work support having my improved thread laying mechanism applied thereto;

Fig. 2 1s a front View of the same;

Fig. 3 is a plan view with the needle bar and presser foot removed and a portion of the machine broken away to show diagrammatically the relation of the needles, the thread guide and the thread hook, the thread hook being at the rear end of its stroke;

Fig. 4 is adetail view partly in section showing the operating devices for the thread hook, the needle, the presser foot and part which show by way of bodiment of the inventhe needles and presents of the work support, said thread hook being at the forward end of its stroke and at a dwell;

Fig. 5 is an enlarged view, show' diagrammatically the relation of the needles, the needle threads, the thread hook, the thread guide and the thread laid by thread hook, the thread hook being at the rear end of its stroke;

Fig. 6 is .a similar view, but with the thread hook at the forward end of its stroke and positioning a loop for the entrance of the needle farthest removed from the thread guide.

In carrying out my invention, I have provided a sewing machine having, as shown in line substantially at right angles to the line of feed. A single looper coiiperates with these needles beneath the work support. The looper thread will, therefore,'be concatenated with the needle thread loops of both needles. Cooperating with the needles above the work support is my improved cross thread laying mechanism which includes a fixed thread guide and a movable thread hook. The movable thread hook oscillates back and forth across the line of feed and in a tween the two needles thread carried by the which is located in rear of the plane of the needles, and form a loop in said thread and position the same for the entrance only of the needle which is farthest from the thread guide. The thread hook is oscillated by a toggle link construction which gives an extended dwell to the hook when it is at the forward end of its stroke so that it will hold the thread loop carried thereby taut until the needle has passed by the strands of the loop and then quickly retract the hook from under the needle thread adjacent the fixed guide.

Referring more in detail to ings:

My improved thread laying mechanism is shown as applied to a sewlng machine having a work support, indicated by the nnmeral 1. the free end of an over-hanging arm 3 and carries two needles 4 and 5. Cooperating with the needles 4 and 5 beneath the work support is a looper 6 which is provided with a looper thread Z. The looper enters both path extending beso as to engage the fixed thread guide,

the draw- The needle bar 2 reciprocates in lower end of a shaft arm 25. This rock of feed, as is clear from this figure.

the needle thread loops formed by the needle 4 and the needle 5 and, therefore, the looper thread is concatenated with both needle threads beneath the work support. The material is held on the work support byaa presser foot 7 carried by a presser bar mounted in the head ofthe overhanging arm.

The thread for the needle 4' is indicated at n, while the thread for the needle 5 is indicated at n. Gotiperating with the needles above the work support 1s my 1mproved thread laying mechamsm which operates to concatenate the cross thread a with the needle threads so as to connect the needle threads. The thread a is led fromits supply throu h suitable guides to a thread guide 9.- his thread guide 9 has aneye 10 at its lower end through whlch the thread passes, and said thread uide 1s rlgidly secured to the head at the orward end ofthe overhanging arm by screws 11 and 12. The thread guide is fixed and 1s positioned so that the same. is slightly in rear of a vertical plane passing through the two needles, as shown in Fig. 1, and at one side of the needles.

Cooperating with the thread guide 1s a thread hook 13. This thread hook is secured to an arm 14; which is clamped to the 15 mounted to oscillate in bracket arms 16 and 17 which are formed integral with the head at the forward end of the overhanging .arm'3, said bracket arms extending rearwardly and slightly disposed at one side of the line of feed, as clearly shown in Fig. 3. The axis of the shaft 15 is, therefore, slightly-to the left of the llifie e shaft 15 isheld in its bearings by a cap collar 18 which is secured to the shaft by a set-screw 19. The arm 14: projects from a collar 20 which is secured to the lower end of the shaft 15 by a set-screw. This collar 20 is also provided with a second arm 22 which carries a ball stud 23 on its outer end. Mounted on a short stub shaft 24 is a rock arm is forked at 26 so as to straddle the ball 23 carried by the arm 22. Said rock arm 25 is pivoted at 27 to a link 28. The other end of this link 28 is pivoted to'a depending arm 29 carried by a shaft 30 mounted in suitable bearings, one of which is indicated at 31. These bearings are carried by the overhangin' arm of the machine, and the shaft 30 is osclllated in. any well-known way The stub shaft 24. is held in place by a collar 32 which is secured thereto by a set-screw 33.

The book 13 is a fish-tail hook, that is, it is formed with a V-shaped notched end. The body of the hook is relativel thin, and said hook is set in a vertical p am. Said hook is adjustably secured 'to the arm 9 by any suitable means. The thread a, before eye 35 is also carried by the arm and assists in directing the thread to the tension: The threadhook 13 moves in'the arc of a circle,

the center of which is the axis of the shaft 15. Inasmuch as this center is set at one side of the line of feed and is, therefore, not directly-in rear of the needles, will move in a path between the needles, as clearly shown 'in Figs. 5 and 6. y

In Fig. 5 of the drawings, the needles are down and the hook is at the rear end of its stroke Whenthe hook moves forward, the notched end thereof will engage the cross through the guide eye '10; passes" the hook.

thread a and the hookwill move between the paths of the needles. and to the forward end of its stroke, as shown in Fig. 6. The needles are substantially at the upper end of their stroke or have moved downwardly slightly when the hook reaches the forward end of its stroke. While the hook is moving to the forward end of its stroke, the feed of the fabric takes place. This carries the connection of the thread a to the previously formed stitch rearwardly so that the hook bends the thread at around the previously formed loop. When the hook reaches the forward end of its stroke, the loop carried thereby is so positioned that the strand of the loop that said strand is in rear of both needles,

Therefore, the feed of the fabric extending from the end of the hook i to the reviously formed stitch is wholly in,

while the thread guide positions the other strand so that it is in rear of the needle nearest the thread guide, and only the needle farthest removed from the thread guide will enter the loop formed by the thread hook.

It will be noted that the arm 29 is connected by a link 28 to the rock arm 25. In Fig. 1, the parts are shown with the hook in its retracted position. When the hook is at the forward end of its stroke, the pivotal connection between this link 28 and the arm 29 is moved substantially into alinement with the center of the shaft 30 and the pivotal point 27 between the link 28 and the arm 25, and this, for obvious reasons, gives an extended dwell to the thread hook at the forward end of its stroke which holds the loop formed thereby taut until the needle entering the loop has passed well by the strands of the loop.

While I have shown the thread guide 9 thread guide, which Substantially a fixed relative to the needles. It will be understood, of course, that the thread hook may be changed as to its structure, location and as to its path ofmovement without departing from the spirit of the invention, the essential feature that the thread guide, the thread hook and the feed of the fabric mutually cooperate to form a loop in the thread carried by the loop is so positioned that only the needle farthest from the thread guide enters the same.

By placing a tension on the arm which supports the thread hook, it will be apparent that I am able to use said arm to pull on the thread a when the hook is retracted to draw the loop formed in the thread a taut around the shank of the needle farthest from the fixed thread guide.

While my improved thread laying mechanism may be used for forming an ornamental seam, it is preferably used for a uniting seam for joining the abutting edges of fabrics. In Figs. 5 and 6, I have shown two fabric sections abutted and joined. The needle 4 enters one section of fabric, While the needle 5 enters the other section of fabric. The looper thread Z joins the needle loops beneath the fabric, while the thread a laid by my improved thread laying mechanlsm concatenates with every needle thread loop' and joins the needle threads n and n on the upper face of the fabric. The pull on the thread a above referred to, draws the thread a taut about the needle loops, and thus all undesirable slack is taken out of the thread a so that the fabric edges are held abutted.

Having thus described the invention, what is claimed as new is 1. The combination of a work support, feeding mechanism,'a pair of needles arranged in a plane at an angle to the'line of feed, a fixed thread guide disposed at one side of the needles, a thread carrier movable across the line of feed for engaging a cross thread passing through said thread guide and forming a loop therein for the entrance only of the needle farthest removed from said thread guide, said feeding mechanism, said thread carrier, and said thread guide cooperating to position said cross thread loop so that the strand extending from the previously formed stitch to the end of the thread carrier is located wholly in rear of the needles, and the strand of said loop extending from said thread guide to the end of the thread carrier is disposed between the needles.

.2. The combination of a work support, feeding mechanism, a pair of needles arranged in a plane at right angles to the line position horizontally being of the plane of the needles, a thread hook movable across the line of feed. and adapted to engage a cross thread" extending through said thread guide and form a loop therein for the entrance onl of the needle farthest removed from said tliread guide.

3. The combination of a work support, feeding mechanism, a pair of needles arranged in a plane at right angles to the line of feed, a fixed thread guide disposed at one side of the needles and slightly in rear of the plane of the needles, a thread hook movl able across the line of feed and adapted to engage a cross thread extending through said thread guide and form a loop therein for the entrance only of the needle farthest removed from said thread guide, and means for oscillating said thread hook and for giving an extended dwell'thereto at the forward end of its stroke, whereby said loop, carried by the hook will be held taut until the needle entering the same has passed by the strands of the loop.

4. The combination of a work support, feeding mechanism, a pair of needles arranged in a plane at right angles to the line of feed, a thread guide disposed at one side of the needles and slightly in rear of the plane of the needles, a thread hook movable across the line of feed and adapted-to engage a cross thread extending through said thread guide and form a loop therein for the entrance only of the needlefar'thest removed from said thread guide, an oscillating arm carrying said thread hook, a tension device mounted on said arm through which thethread is led to the thread guide, whereby when the hook moves rearwardly said tension device will exert a pull on the thread carried by the thread guide and draw the same taut around the shank of the needle entering the loop in the cross thread.

5. The combination of a work support, feeding mechanism, a pair of needles ar ranged in a plane at right angles to the line of feed, a fixed thread uide disposed at one side of the needles and slightly in rear of the plane of the needles, a thread hook movable across the line of feed and adapted to engage the thread extending through said thread guide and form a loop therein for the entrance only of the needle farthest removed from said thread guide, means for oscillating said thread hook and for giving an extended dwell thereto at the forward end of its stroke, and means for exerting a pull on the thread when released by the thread hook so as to draw the same taut about the shank of the needle entering the thread loop.

6. The combination of a work support, feeding mechanism, a pair of needles arranged in a plane and at an angle to the line of feed, a thread guide at one side of arm carrying said thread hook, thepivotal i from the thread the thread guide,

support of said oscillatin arm be disposed on the opposite si ed the line-of feed from the thread guide, whereby said thread hook will oscillate in a path passing between the needles for en agin the thread. carried by the thread gui e an forming a loop therein for-the entrance'only of the needle farthestcremoved from the thread guide. 1 v 7. The combination of a work support,

feeding-mechanism, a pair of needles arran ed in a lane and at an angleto the line of eed, a t read guide at-one side of the needles, a thread hook, an oscillating arm carrying said thread hook, the pivota support of said oscillating arm being'd1sposed on the opposite side of the line of. feed from v whereby said thread hook will oscillate in a path passing between the" needles and engage the thread carried by the thread guide and form a loop therein for the entrance only of the needle farthest removed ide, and means for oscillating said arm, lncluding a toggle for giving'an extended dwell to the hook when the thread loop is in position for the entrance of a the needle.

8. The combination of a work support, feeding mechanism, a pair of'needles arran ed in a lane and at an angle to the line of eed, a t read guide at one side of the needles, a thread ook, an oscillatin arm carrying said thread hook, the pivota support of said oscillating arm being disposed on the opposite side of the line of feed from the thread guide, whereby said thread hook will oscillate in a path passing between the needles and engage the thread carried by the thread guide an form a 100 therein for the entrance only of the need e farthest re- ,eet

moved fromfthe thread oscillating said arm, inclu ngl a toggle for givin an extended dwell to t e hook when the t read loop is in position for the entrance of the needle, and devices for exerting a pull on the thread thereby so as to draw said thread taut about the shankof the needle.

guide, means to? assing through'the thread l carrler when t e' thread hook is -moved to release thethread loop formed 9. The combination ofia wbrk support,

feeding mechanism, a pair of needles arranged in a plane atan angle to'the line of feed, a fixed thread guide disposed at one side of the needles, a thread carrier movable across the line'of feed for engaging a cross thread passing through said thread guide and forming a loop therein for the entrance only of the needle farthest removed from said thread guide, said feeding mechanism, said thread carrier, and said thread guide cooperating to position said. crosswthread loop so that the strand extending from the previously-formed stitch to the end of the thread carrier will be located wholly in rear I of the needles, and the strand of said loop extendin from said thread of the t read carrier will edisposed between the needles, and devices for exerting a pull on the thread passing through the thread carrier when the thread hook is moved to release the thread loop formed thereby so as to draw said thread taut about the shank of the needle. I v

In testimony whereoLI aflix my signature, in the presence of two witnesses. k

' SAMUEL GEORGE .TATE. Witnesses: I i i Jos. H. Masneno, A. B. Cnornmn:

guide to the end 

